Why is the fast-charging feature not working on my Huawei Mate 20 lite?

When I connect and charge my Huawei Mate 20 lite with the enclosed Quick Charge Adapter only one flash is shown instead of two and it charges normally. But I want it to load quickly, so I wonder how it works. Usually this is already activated automatically, but why is not it for me?

Do you use the original charging cable? With some cheap charging cables, fast charging is not supported.

Maybe you have disabled it in the settings synonymous.

Yes, I use the original charging cable and I do not find the option to enable / disable Fast Charging in the settings.

Strange… I would test another cable.